#include<iostream>
#include<limits>
#include<math.h>

using namespace std;
typedef unsigned long long ull;

int main()
{
    unsigned long long a =std::numeric_limits<ull>::max();
    cout<<a<<endl;
    cout<<log10(a)<<endl;
    cout<<"hello world C++"<<endl;
    printf("%d\n",sizeof(unsigned int));
    printf("%d\n",sizeof(int));
    return 0;
}
